Mercruiser 7.4 manifolds and risers - City of Toronto Parts, Trailers ...1 day ago . brand new oem manifolds and risers never used but out of the box no gaskets or bolts.. Read & reply to . Mercruiser 7.4 manifolds and risers .http://toronto.kijiji.ca/c-cars-vehicles-boats-watercraft-parts-trailers-accessories-Mercruiser-7-4-manifolds-and-risers-W0QQAdIdZ369021500